<https://forum.spamcop.net/topic/8945-personal-blacklist-appears-to-be-ineffective/#comment-61156>
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"I'm not all that enthralled with the search function here, so instead, I ran a phrase search on \"personal blacklist\" using this Google URL: \n\nhttp://www.google.com/custom?domains=spamcop.net \n\nIt produces about 613 hits: \n\nhttp://www.google.com/custom?hl=en&amp;c2c...rch=spamcop.net \n\nmaybe some might be of use...maybe not. I haven't use the personal blacklist in a long time. However, I just added one of my own domains to my personal blacklist and sent a test message, which was properly routed into  my Held mail folder. However, further testing using IP addresses did *not* work. First I added the IP assigned by my own provider, then I worked my way through their outbound IPs, including the one that actually hands the messages to the SC mail exchangers...no luck. I'd say that only domains and email addresses will work, which agrees with what is found here: \n\nhttp://www.spamcop.net/fom-serve/cache/304.html \n\nSo, to summarize, domains, subdomains, email addresses and truncated email addresses all should be working OK, but not IP addresses. \n\nI did find what looks to be a bug when adding items to my personal blacklist, in that a blank entry gets added at the very top of the list when I add to the list. This only happens once -- IOW, the system doesn't create multiple blank entries, but only one. \n\nDT \n"
<https://forum.spamcop.net/topic/8945-personal-blacklist-appears-to-be-ineffective/>